Lower-than-expected demand for Apple’s new iPhones and the company’s decision to offer more models have created turmoil along its supply chain and made it harder to predict the number of components and handsets it needs.143

Auto makers and other companies racing to commercialize self-driving car technology are facing pushback from local politicians, complicating their plans to bring real-world testing to more U.S. cities.90

Heard on the Street

Personal Technology

Companies from Silicon Valley to Detroit are racing to become the first to bring driverless cars to the mass market. But doing so relies on autonomous vehicles’ sensors properly interpreting inputs from the environment, and that’s not as easy as it seems.

Facebook’s new video-calling device makes users feel as if they are in the same room, says columnist Joanna Stern. But with privacy concerns now front and center, the Portal can’t be completely trusted.82

A tidal wave of cash has helped turn China’s internet startups into formidable superpowers rivaling their U.S. counterparts. But venture capitalists argue that a unique set of forces are also spurring the startups’ ascendancy.